In this study, the aerial parts of Tripleurospermum disiforme were collected in complete flowering stage from Taleghan in July 2001. After drying in shade, the plant material was subjected to steam distillation. The pale yellow oil was obtained at 0.45% (w/w) yield. The oil was analyzed by a combination of GC and GC/MS. Results of this investigation that was done the first time in Iran, were identification of 14 compounds (representing 94.93% of the oil) by percentage more than 0.07% in the

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... The main components of Tripleurospermum disiforme oil were trans, trans matricaria ester (39.93%), cis calamenene (22.99%), (Z)-b-farnesene (12.54%), b-maaliene (7.98%) and b-sesquiphellandrene (2.22%).